R520 bios settings to start Hyper-V on Windows Server 2012 R2

Hello,

Having trouble executing virtual machines on Hyper-V of Windows 2012 R2 Standard at PE R520. It just doesn’t start VMs, complaining that “hypervisor not running” (event 20148, Hyper-V-VMMS) and “Virtualization infrastructure driver (VID) not working” (event 15350, Hyper-V-VMMS). Turning “virtualization technology” and “execute disable” CPU features in BIOS on and off and on again (reboots in between) gave nothing. The BIOS interface doesn’t provide a way to adjust the “virtualization technology” any deeper, f.ex., enable or disable only VT-d or smth. as a part of VT. Some people out there have succeeded with it adjusting some particular CPU features in BIOS, but with PE R520 I can see to only turn VT feature ON or OFF as a whole, via OMSA or the console.

Executing “bcdedit /set hypervisorlaunchtype auto” with administrative privileges gave the same nothing.

As experienced, Hyper-V on Windows 2008 R2, previously hosted on the platform, had none of such a weird complication.

Among CPU attributes, everything is enabled but the “Demand Based Switching(DBS)” and “Turbo Mode” ones.

Can I do anything aside of returning to W2008R2 to solve this issue and to make the Hyper-V on W2012R2 to work properly on R520?

Or may it be the issue doesn’t have any roots in the R520 platform specifics?

Some details:

BIOS version: 2.7.0

CPU: Intel(R) Xeon(R) CPU E5-2440 0 @ 2.40GHz (1 piece)

64 GB of DDR3 RAM

Thanks a lot for your attention in advance!